Question: When was Jadwiga of Poland married to Wladyslaw II Jagiello?
Paraphrase: jadwiga married wladyslaw ii jagiello in what year
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q53449 p:P26 ?s . ?s ps:P26 wd:Q54049 . ?s pq:P580 ?value}